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drm_cache.c revision 1.2 
      1 /*	$NetBSD: drm_cache.c,v 1.2 2018/08/27 04:58:19 riastradh Exp $	*/
      2 
      3 /**************************************************************************
      4  *
      5  * Copyright (c) 2006-2007 Tungsten Graphics, Inc., Cedar Park, TX., USA
      6  * All Rights Reserved.
      7  *
      8  * Permission is hereby granted, free of charge, to any person obtaining a
      9  * copy of this software and associated documentation files (the
     10  * "Software"), to deal in the Software without restriction, including
     11  * without limitation the rights to use, copy, modify, merge, publish,
     12  * distribute, sub license, and/or sell copies of the Software, and to
     13  * permit persons to whom the Software is furnished to do so, subject to
     14  * the following conditions:
     15  *
     16  * The above copyright notice and this permission notice (including the
     17  * next paragraph) shall be included in all copies or substantial portions
     18  * of the Software.
     19  *
     20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     22  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
     23  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
     24  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
     25  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
     26  * USE OR OTHER DEALINGS IN THE SOFTWARE.
     27  *
     28  **************************************************************************/
     29 /*
     30  * Authors: Thomas Hellstrm <thomas-at-tungstengraphics-dot-com>
     31  */
     32 
     33 #include <sys/cdefs.h>
     34 __KERNEL_RCSID(0, "$NetBSD: drm_cache.c,v 1.2 2018/08/27 04:58:19 riastradh Exp $");
     35 
     36 #include <linux/export.h>
     37 #include <drm/drmP.h>
     38 
     39 #if defined(CONFIG_X86)
     40 #include <asm/smp.h>
     41 
     42 /*
     43  * clflushopt is an unordered instruction which needs fencing with mfence or
     44  * sfence to avoid ordering issues.  For drm_clflush_page this fencing happens
     45  * in the caller.
     46  */
     47 static void
     48 drm_clflush_page(struct page *page)
     49 {
     50 	uint8_t *page_virtual;
     51 	unsigned int i;
     52 	const int size = boot_cpu_data.x86_clflush_size;
     53 
     54 	if (unlikely(page == NULL))
     55 		return;
     56 
     57 	page_virtual = kmap_atomic(page);
     58 	for (i = 0; i < PAGE_SIZE; i += size)
     59 		clflushopt(page_virtual + i);
     60 	kunmap_atomic(page_virtual);
     61 }
     62 
     63 static void drm_cache_flush_clflush(struct page *pages[],
     64 				    unsigned long num_pages)
     65 {
     66 	unsigned long i;
     67 
     68 	mb();
     69 	for (i = 0; i < num_pages; i++)
     70 		drm_clflush_page(*pages++);
     71 	mb();
     72 }
     73 #endif
     74 
     75 void
     76 drm_clflush_pages(struct page *pages[], unsigned long num_pages)
     77 {
     78 
     79 #if defined(CONFIG_X86)
     80 	if (cpu_has_clflush) {
     81 		drm_cache_flush_clflush(pages, num_pages);
     82 		return;
     83 	}
     84 
     85 	if (wbinvd_on_all_cpus())
     86 		printk(KERN_ERR "Timed out waiting for cache flush.\n");
     87 
     88 #elif defined(__powerpc__)
     89 	unsigned long i;
     90 	for (i = 0; i < num_pages; i++) {
     91 		struct page *page = pages[i];
     92 		void *page_virtual;
     93 
     94 		if (unlikely(page == NULL))
     95 			continue;
     96 
     97 		page_virtual = kmap_atomic(page);
     98 		flush_dcache_range((unsigned long)page_virtual,
     99 				   (unsigned long)page_virtual + PAGE_SIZE);
    100 		kunmap_atomic(page_virtual);
    101 	}
    102 #else
    103 	printk(KERN_ERR "Architecture has no drm_cache.c support\n");
    104 	WARN_ON_ONCE(1);
    105 #endif
    106 }
    107 EXPORT_SYMBOL(drm_clflush_pages);
    108 
    109 void
    110 drm_clflush_sg(struct sg_table *st)
    111 {
    112 #if defined(CONFIG_X86)
    113 	if (cpu_has_clflush) {
    114 		struct sg_page_iter sg_iter;
    115 
    116 		mb();
    117 		for_each_sg_page(st->sgl, &sg_iter, st->nents, 0)
    118 			drm_clflush_page(sg_page_iter_page(&sg_iter));
    119 		mb();
    120 
    121 		return;
    122 	}
    123 
    124 	if (wbinvd_on_all_cpus())
    125 		printk(KERN_ERR "Timed out waiting for cache flush.\n");
    126 #else
    127 	printk(KERN_ERR "Architecture has no drm_cache.c support\n");
    128 	WARN_ON_ONCE(1);
    129 #endif
    130 }
    131 EXPORT_SYMBOL(drm_clflush_sg);
    132 
    133 void
    134 drm_clflush_virt_range(void *addr, unsigned long length)
    135 {
    136 #if defined(CONFIG_X86)
    137 	if (cpu_has_clflush) {
    138 		const int size = boot_cpu_data.x86_clflush_size;
    139 		void *end = addr + length;
    140 		addr = (void *)(((unsigned long)addr) & -size);
    141 		mb();
    142 		for (; addr < end; addr += size)
    143 			clflushopt(addr);
    144 		clflushopt(end - 1); /* force serialisation */
    145 		mb();
    146 		return;
    147 	}
    148 
    149 	if (wbinvd_on_all_cpus())
    150 		printk(KERN_ERR "Timed out waiting for cache flush.\n");
    151 #else
    152 	printk(KERN_ERR "Architecture has no drm_cache.c support\n");
    153 	WARN_ON_ONCE(1);
    154 #endif
    155 }
    156 EXPORT_SYMBOL(drm_clflush_virt_range);
    157